Insecticidal efficacy of local diatomaceous earth compositions with different particle sizes against stored grain pests

Abstract

In this study, the efficacy of a mixture of local diatomaceous earth (DE) with different diatomite compositions and particle sizes against stored-grain pests, Sitophilus oryzae L., 1763 (Coleoptera: Curculionidae), Tribolium confusum du Val, 1863 (Coleoptera: Tenebrionidae), and Rhyzopertha dominica (F., 1792) (Coleoptera: Bostrichidae) adults was investigated in 2023 in the Entomology Laboratory of the Department of Plant Protection, Faculty of Agriculture, KSU. In biological tests, 500 and 1000 ppm concentrations (mg DE/kg wheat) of different particle sizes (≤ 20, 20-75, 75-150, and ≥ 150 µm) of DE mixture and original DE (≤ 250 µm) were applied to wheat. The highest mortality rate for all insect species tested at 500 ppm was obtained from DE treatments of ≤20 µm. At 1000 ppm, 100% mortality was observed for T. confusum and S. oryzae in almost all particle size DE-treatments, whereas no local DE treatments resulted in 100% mortality for R. dominica adults. Moreover, the greatest reduction in the number of F1 generation adults for S. oryzae and R. dominica was obtained in the DE treatment of ≤20 µm at 500 and 1000 ppm. In conclusion, local DE mixture treatments with ≤ 20 µm particle size were found to be highly effective in the control of stored-grain pests.

Keywords

• Diatomite composition
• local diatomaceous earth
• particle size
• stored-grain insect pests

Farklı partikül boyutlarına sahip yerel diatom toprağı kompozisyonların depolanmış tahıl zararlılarına karşı insektisidal etkinliği

Öz

Bu çalışmada, farklı diyatomit bileşimlerine ve partikül boyutlarına sahip yerel diyatom toprağı (DE) karışımının depolanmış tahıl zararlıları Sitophilus oryzae L, 1763 (Coleoptera: Curculionidae), Tribolium confusum du Val, 1863 (Coleoptera: Tenebrionidae) ve Rhyzopertha dominica (F., 1792) (Coleoptera: Bostrichidae) erginlerine karşı etkinliği 2023 yılında KSÜ Ziraat Fakültesi Bitki Koruma Bölümü Entomoloji Laboratuvarında araştırılmıştır. Biyolojik testlerde, DE karışımı ve orijinal DE'nin (≤ 250 µm) farklı partikül boyutlarının (≤ 20, 20-75, 75-150 ve ≥ 150 µm) 500 ve 1000 ppm konsantrasyonları (mg DE/kg buğday) buğdaya uygulanmıştır. Test edilen tüm böcek türleri için 500 ppm'de en yüksek ölüm yüzdesi ≤20 µm DE uygulamalarından elde edilmiştir. 1000 ppm'de, T. confusum ve S. oryzae için neredeyse tüm partikül boyutu DE uygulamalarında %100 ölüm gözlenirken, hiçbir yerel DE uygulaması R. dominica erginleri için %100 ölümle sonuçlanmamıştır. Ayrıca, S. oryzae ve R. dominica için F1 nesli ergin sayısındaki en büyük azalma 500 ve 1000 ppm'de ≤20 µm DE uygulamasında elde edilmiştir. Sonuç olarak, ≤ 20 µm partikül boyutuna sahip yerel DE karışımı uygulamalarının depolanmış tahıl zararlılarının kontrolünde oldukça etkili olduğu bulunmuştur.

Anahtar Kelimeler

• Diatomit kompozisyonu
• yerel diatomit toprağı
• partikül büyüklüğü
• depolanmış tahıl zararlıları

Kaynakça

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